What will come in place of the question mark (?) in the given number series?
18 9 9 18 72 ?
Numbers of the form $$2^n$$ are multiplied, where $$n \geq -1$$
18 $$\times 2^{-1}$$ = 9
9 $$\times 2^{0}$$ = 9
9 $$\times 2^{1}$$ = 18
18 $$\times 2^{2}$$ = 72
72 $$\times 2^{3}$$ = 576
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